Sources have told the UK press that they spotted the Prince, who celebrated his 30th birthday earlier this week, at the movies with Cressida on what appeared to look like a date.
The Sun reported that the young royal and his former beau were seen at a cinema complex near Kensington Palace in west London where they saw the Cameron Diaz comedy, Sex Tape.
The speculation of a reunion was first hinted at when Cressida, 25, was spied laughing and chatting with Harry at the closing ceremony of the Invictus Games on Sunday, an event organised by Harry.
Sources reported that after the covert date the Prince was driven away by police protection officers while Cressida took a cab.
Harry has reportedly been yearning to get back with his ex after they spilt in April and an insider told People that the feeling was mutual.
“They were really in love with each other, and it was a painful decision to part. Their relationship wasn’t working out,” the source said.
Cressida was rumoured to have split with Harry because she was uncomfortable living under the spotlight.